DE102010045280A1 - Pressure relief valve i.e. safety valve, for protecting boiler against high pressure, has valve seat, valve body and spring element forming valve insert, which is mountable as unit in valve housing and demountable as unit from housing - Google Patents

Abstract

The valve (10) has a spring element (16) providing resilient force for pressing a valve body (15) against a valve seat (14) for closing the valve. The body is lifted from the valve seat against the resilient force to open the pressure relief valve for opening the valve when force acting on the valve body is larger than the resilient force. The force acting on the body is based on pressure prevalent in a valve-inlet. The valve seat, the valve body and the spring element forms a valve insert (17), which is mountable as a unit in a valve housing (11) and demountable as the unit from the housing.

Description

The invention relates to a pressure relief valve according to the preamble of claim 1.

Safety valves designed as pressure limiting valves, by means of which devices, such as, for example, water heating boilers, can be protected against overpressure, are well known in practice. Such pressure relief valves have a valve housing which provides a valve inlet, a valve outlet and a valve seat of the pressure relief valve. Furthermore, such pressure relief valves have a valve body and a spring element, wherein a spring force provided by the spring element presses the valve body against the valve seat for closing the pressure relief valve. The valve body is then lifted from the valve seat to open the pressure relief valve and to dissipate excess pressure against the spring force provided by the spring element when a force acting on the valve body force, which is dependent on a pressure prevailing in the valve inlet pressure and counteracts the spring force of the spring element, greater as the spring force provided by the spring element.

Known from practice pressure relief valves have a variety of items and therefore a complex structure. Therefore, both the installation of known from practice pressure relief valves as well as in a maintenance or repair of the same disassembly expensive. There is therefore a need for a pressure relief valve, which can be assembled and disassembled with little effort.

The invention is based on the object to provide a novel pressure relief valve. This object is achieved by a pressure relief valve according to claim 1. According to the invention, the valve seat, the valve body and the spring element form a valve insert which can be mounted as a unit in the valve housing and can be disassembled as a unit from the valve housing.

With the present invention, a pressure relief valve is proposed for the first time, in which the valve seat, the valve body and the spring element form a valve insert which can be mounted as a unit in the valve housing and disassembled as a unit from the valve housing. This simplifies both the assembly and disassembly of a pressure relief valve.

The valve insert preferably has an adapter, which forms the valve seat and over which the valve insert can be screwed for assembly as a unit into the valve housing and can be unscrewed as a unit from the valve housing for disassembly. The valve body and the spring element are preferably inserted into the adapter and fixed in the adapter via a guide element which is latched to the adapter. The above embodiment of the adapter, which is bolted to the valve housing, as well as the above embodiment of the guide element, which is locked to the adapter, allows mounting and dismounting of the pressure relief valve without additional tools.

Preferred embodiments of the invention will become apparent from the dependent claims and the description below. Hereinafter, embodiments of the invention, without being limited thereto, explained in more detail with reference to the drawing. In the drawing shows:

1 a cross section through an inventive pressure relief valve;

2 the detail A of the pressure relief valve of 1 ;

3 the detail B of the pressure relief valve of 1 ;

4 the detail C of the pressure relief valve of 1 ; and

5 a cross section through the valve core of the pressure relief valve of 1 to one opposite 1 circumferentially offset cutting direction.

The present invention relates to a pressure relief valve to protect, for example, devices for heating water from overpressure. With reference to 1 to 5 a preferred embodiment of a pressure relief valve according to the invention will be described.

1 shows a cross section through a pressure relief valve 10 , wherein the pressure relief valve 10 a valve housing 11 having a valve inlet 12 and a valve outlet 13 having.

Furthermore, the pressure relief valve has 10 via a valve seat 14 , a valve body 15 and a spring element 16 , one of the spring element 16 Provided spring force the valve body 15 against the valve seat 14 the pressure relief valve 10 presses and so the pressure relief valve 10 closes.

It also acts on the valve body 15 a force coming from a pressure inside the valve inlet 12 is dependent, in which case if this from the Pressure in the valve inlet dependent force greater than that of the spring element 16 provided spring force is the valve body 15 from the valve seat 14 is lifted, so the pressure relief valve 10 open and for pressure equalization in the valve inlet 12 in the medium through the valve outlet 13 can drain away.

According to the invention form the valve seat 14 , the valve body 15 and the spring element 16 a valve insert 17 off, acting as a unit in the valve body 11 mountable and as a unit from the valve body 11 is removable.

The valve insert 17 includes an adapter 18 , which at a section the valve seat 14 forms and the over an external thread 19 features, which with an internal thread 19 of the valve housing 11 cooperates in such a way that the adapter 18 for mounting the pressure relief valve with the valve body 11 screwed and for disassembly of the valve body 11 is screwed out. About the adapter 18 is the entire valve insert 17 as a unit with the valve body 11 screwed as well as from the valve body 11 screwed out.

Then, if the adapter 18 with the valve body 11 is bolted, is the adapter 18 on the one hand via the above screw connection between the adapter 18 and the valve housing 11 and on the other hand via a sealing ring 20 opposite the valve housing 11 sealed, taking on the adapter 18 an assembly aid 21 for the sealing ring 20 is formed, which the sealing ring 20 during assembly and disassembly of the valve core 17 on the adapter 18 holds. Will therefore the valve insert 17 over the adapter 18 from the valve body 11 dismantled, this is how this assembly aid 21 of the adapter 18 sure the sealing ring 20 together with the valve core 17 safely out of the valve body 11 is removed and does not remain in the same.

The valve body 15 and the spring element 16 of the valve insert 17 are in the adapter 18 used and via a guide element 22 of the valve insert 17 in the adapter 18 fixed, with the guide element 22 of the valve insert 17 with the adapter 18 the same is locked.

The valve body 15 is from a valve lifter 23 and a membrane 24 educated. The spring element 16 engages with a first end 25 on the valve lifter 23 and pushes the membrane 24 over the valve lifter 23 against the valve seat 14 , At an opposite, second end 26 grips the spring element. 16 on the guide element 22 valve insert 17 at.

The guide element 22 of the valve insert 17 according to 1 over a middle section 27 which is in the spring element 16 in the area of the second end 26 the same protrudes and on which the spring element 16 with the second end 16 is applied. A side section 28 of the guide element 22 is with the adapter 18 latched, namely such that the lateral section 28 of the guide element 22 barbed with a heel 29 or an undercut of the adapter 18 is locked (see 3 ).

Then, if the unit is made of valve body 15 , Spring element 16 and guide element 22 in the adapter 18 by locking the guide element 22 with the adapter 18 is fixed, provides the spring element 26 a defined spring force, which is the valve body 15 against the valve seat 14 suppressed. This spring force is of the spring constant of the spring element 16 dependent only by selecting a suitable spring element 16 adjustable.

The membrane 24 of the valve body 15 is like 1 can be removed, preferably designed as a hat-shaped membrane, wherein the spring element 16 over the valve lifter 23 a middle section 30 the membrane 24 against the valve seat 14 suppressed. A lateral, opposite the middle section 30 offset section 31 the hat membrane 24 is between the adapter 18 and the guide element 22 fixed or clamped.

Alone through the adapter 18 who has the valve seat 14 provides the valve body 15 that of the valve lifter 23 and the membrane 24 is formed, the spring element 16 and the guide element 22 the functionality of the pressure relief valve according to the invention can be provided. The pressure relief valve according to the invention therefore has a small number of components, as a unit, namely as a valve core 17 , together on the valve body 11 can be mounted as well as dismantled from the same, namely without the aid of separate tools.

In the illustrated preferred embodiment of the pressure relief valve according to the invention, the valve insert comprises 17 in addition to the above-mentioned modules an actuator 32 that with the guide element 22 is locked and opposite the guide element 22 as well as opposite the valve body 15 namely, the valve lifter 23 the same is rotatable.

According to 1 . 5 surrounds the actuator 32 the guide element 22 radially outside at least in sections. Furthermore, the guide element surrounds 22 radially outside the valve body 15 namely, the valve lifter 23 same, at least in sections. In the guide element 22 is a recess 33 introduced, through which a section 34 of the valve lifter 23 radially outward in the direction of the actuating element 32 extends and with a corresponding section 35 of the actuating element 32 works together so that by turning the actuator 32 the valve body 15 relative to the valve seat 14 is displaceable to the valve body 15 triggered by the actuation of the actuator 32 from the valve seat 14 lift off and so blocking the valve body 15 at the valve seat 14 to avoid.

LIST OF REFERENCE NUMBERS

10

Pressure relief valve

11

valve housing

12

Inlet valve

13

Valve outlet

14

valve seat

15

valve body

16

spring element

17

valve core

18

adapter

19

Male / female thread

20

seal

21

mounting aid

22

guide element

23

tappet

24

membrane

25

first end of the spring element

26

second end of the spring element

27

middle section of the guide element

28

lateral section of the guide element

29

Paragraph of the adapter

30

middle section of the membrane

31

lateral section of the membrane

32

actuator

33

recess

34

section

35

section

Claims (10)

A pressure relief valve, comprising a valve housing having a valve inlet and a valve outlet, with a valve seat, with a valve body and with a spring element, wherein a spring force provided by the spring element presses the valve body for closing the pressure relief valve against the valve seat, and wherein the valve body counter to the spring force provided by the spring element is then lifted off the valve seat to open the pressure relief valve, when a force acting on the valve body, which is dependent on a pressure prevailing in the valve inlet pressure, greater than the spring element provided by the spring element, characterized in that Valve seat ( 14 ), the valve body ( 15 ) and the spring element ( 16 ) a valve core ( 17 ) formed as a unit in the valve housing ( 11 ) mountable and as a unit from the valve housing ( 11 ) is removable. Pressure limiting valve according to claim 1, characterized in that the valve core ( 17 ) an adapater ( 18 ) having the valve seat ( 14 ) and over which the valve core ( 17 ) for mounting as a unit in the valve housing ( 11 ) and for disassembly as a unit from the valve housing ( 11 ) is screwed out. Pressure limiting valve according to claim 2, characterized in that the adapter ( 18 ) an external thread ( 19 ), which with an internal thread ( 19 ) of the valve housing ( 11 ) cooperates. Pressure limiting valve according to claim 2 or 3, characterized in that the adapter ( 18 ) relative to the valve housing ( 11 ) via a sealing ring ( 20 ) is sealed, wherein on the adapter ( 18 ) an assembly aid ( 21 ) for the sealing ring ( 20 ) is formed, which the sealing ring ( 20 ) during assembly and disassembly of the valve core ( 17 ) on the adapter ( 18 ) holds. Pressure limiting valve according to one of claims 2 to 4, characterized in that the valve body ( 15 ) and the spring element ( 16 ) in the Adapater ( 18 ) and via a guide element ( 22 ) with the Adapater ( 18 ) is locked in the Adapater ( 18 ) are fixed. Pressure limiting valve according to one of claims 1 to 5, characterized in that the valve body ( 15 ) of a valve tappet ( 23 ) and a membrane ( 24 ) is formed, wherein the spring element ( 16 ) with a first end ( 25 ) on the valve tappet ( 23 ) and the membrane ( 24 ) over the valve stem ( 23 ) against the valve seat ( 14 ) presses. Pressure relief valve according to claim 5 and 6, characterized in that the membrane ( 24 ) is designed as a hat membrane, wherein the spring element ( 16 ) over the valve stem ( 23 ) a middle section ( 30 ) the hat membrane against the valve seat ( 14 ), and wherein a lateral, opposite the middle section ( 30 ) offset section ( 31 ) the hat membrane between the adapter ( 18 ) and the guide element ( 22 ) is fixed. Pressure limiting valve according to one of claims 5 to 7, characterized in that the guide element ( 22 ) a middle section ( 27 ), which in the spring element ( 16 ) and on which the spring element ( 16 ) with a second end ( 26 ) and that a lateral section ( 28 ) of the guide element ( 22 ) barbed with a heel ( 29 ) of the Adapater ( 18 ) is locked. Pressure limiting valve according to one of claims 5 to 8, characterized by a Actuating element ( 32 ) connected to the guide element ( 22 ) and against the guide element ( 22 ) is rotatable about a rotation of the actuating element ( 32 ) the valve body ( 15 ) relative to the valve seat ( 14 ) to relocate. Pressure limiting valve according to claim 9, characterized in that the actuating element ( 32 ) the guide element ( 22 ) radially outside at least partially surrounds, and that the guide element ( 22 ) the valve body ( 15 ) radially outwardly at least partially surrounds, wherein a portion ( 34 ) of the valve body ( 15 ) the guide element ( 22 ) penetrates radially outward and with a section ( 35 ) of the actuating element ( 32 ) cooperates.

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